Hypertherm HT200LHF-200 Volt HySpeed - Manual (Page 96)

MAINTENANCE
HySpeed HT2000LHF
Instruction Manual
5-7
6
4. The green POWER ON indicator is
illuminated, the START command is
given and the DC ON indicator is
illuminated, but there is no high
frequency and no pilot arc.
4.1. There is no spark between the spark gap electrodes.
Clean (with emery cloth), align and reset the electrode gaps
to .020" (0.51 mm), if necessary. The electrode surfaces
between the gaps should be flat. If the surfaces are
rounded, replace and reset the gap.
• Inspect the high voltage transformer T3 in the power
supply for signs of overheating. See Figure 6-7 for
location of T3 . Replace T3 if it is overheating.
• Check for 120VAC at T3 after the START command is
given.
• If there is no 120VAC at T3, use wiring diagrams in
Section 7
to check pins, connectors and associated
wiring from T3 to relay board PCB4. If connections are
OK, there may be a problem with either PCB4 or PCB2.
• If there is 120VAC at T3 , shut down the system and
remove capacitors C4, C5 and C6. (See Figure 6-7 for
location of C4, C5 and C6) Restart the system and look
for a faint spark across the gaps.
• If a spark is not observed at the gaps, replace T3. If there
is a spark, shut down system, and replace capacitors C4,
C5 and C6.
(Always replace all the capacitors.)
4.2. There is no high frequency at the torch.
Check for a shorted torch, or loose lead connections.
Replace the torch or tighten the lead connections.
Problem Possible Causes
/ Solutions
3.3. One or more of the STATUS LEDs remains illuminated,
indicating a fault condition.
To troubleshoot STATUS fault conditions, see
Status LED
Troubleshooting
later in this section.
5. The green POWER ON indicator is
illuminated, the torch START
command is given and the DC ON
indicator illuminates, and there is
high frequency, but there is no
pilot arc.
5.1. Pilot arc relay CR1 is not closing.
See if the CR1 relay contacts close after the START
command is given. See Figure 6-7 for location of CR1. If
CR1 does not close:
• With an AC voltmeter across the relay, see if 120VAC is
coming from PCB4 after the START command is given.
• If there is no 120VAC, check connectors, terminals, pins,
and associated wiring to PCB4.
• If wiring is OK, there is a problem either with PCB4 or
PCB2.